Thursday, July 8, 2010

The Thursday Theme for this week is some sort of ball or sphere. A Hoberman sphere is actually an icosadodecahedron--a geometric solid consisting of 20 triangles and 12 pentagons. As the sphere expands and contracts, its hubs move in straight lines that radiate from the center. Each point of intersection reinforces the structure. This particular sphere compresses to a 10 inch ball then smoothly expands to a 32 inch sphere.

You can read about the Hoberman Sphere in this article from Wikipedia. If you search for "Hoberman Sphere" on YouTube you can find lots of examples. One is HERE. You can find them in toy stores and museum gift shops or order one from Amazon.com.